I've just upgraded my broadband to BT Infinity, and my download speeds have gone through the roof. I've connected my Sony Freeview HD box to powerline adaptors, and I can now connect to the TV channels from 110 upwards which require an internet connection. When I watch these channels, I can see the graphics and hear the audio, but there's no video image for any of the channels. I know that's a vague problem, but I have updated the firmware of the sony box to the latest version, and can't see anything else I can try - anyone got any ideas on what the issue could be? Thank you!